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Glass knife
A glass knife is a knife with a blade composed of glass. The cutting edge of a glass knife is formed from a fracture line, and is extremely sharp.
Glass knives were used in antiquity due to their natural sharpness and the ease with which they could be manufactured. In modern electron microscopy, glass knives are used to make the ultrathin sections needed for imaging. Diamond knives are also extremely sharp, and the edge lasts much better than glass, but they are extremely expensive.
==History==
Beginning in the Stone Age, glass knives (and other tools, such as arrowheads) were produced through a process known as knapping or lithic reduction. Although such bladed tools were often made of stone, naturally occurring glasses such as obsidian, natural volcanic glass, were also commonly used.
From the 1920s through the 1940s, Dur-X glass fruit and cake knives were sold for use in kitchens under a 1938 US Patent.〔 (US Application Design 112059 S )〕 Before the wide availability of inexpensive stainless steel cutlery they were used for cutting citrus fruit, tomatoes, and other acidic foods, the flavor of which would be tainted by steel knives and which would stain ordinary steel knives. They were molded in tempered glass with ground edges.〔(DUR-X GLASS FRUIT AND CAKE KNIFE )〕〔(Besteck – Knife Fork And Spun )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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